add peekPixels to SkCanvas and SkSurface

include/core/SkBitmapDevice.h

 
 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkBitmapDevice_DEFINED
 #define SkBitmapDevice_DEFINED
@@ skipping 64 matching lines @@
 
     /** Returns true if the device's bitmap's config treats every pixels as
         implicitly opaque.
     */
     virtual bool isOpaque() const SK_OVERRIDE { return fBitmap.isOpaque(); }
 
     /** Return the bitmap config of the device's pixels
     */
     virtual SkBitmap::Config config() const SK_OVERRIDE { return fBitmap.config(); }
 
+    virtual SkImageInfo imageInfo() const SK_OVERRIDE;
+
     /**
      *  DEPRECATED: This will be made protected once WebKit stops using it.
      *              Instead use Canvas' writePixels method.
      *
      *  Similar to draw sprite, this method will copy the pixels in bitmap onto
      *  the device, with the top/left corner specified by (x, y). The pixel
      *  values in the device are completely replaced: there is no blending.
      *
      *  Currently if bitmap is backed by a texture this is a no-op. This may be
      *  relaxed in the future.
@@ skipping 176 matching lines @@
     virtual SkBaseDevice* onCreateCompatibleDevice(SkBitmap::Config config,
                                                    int width, int height,
                                                    bool isOpaque,
                                                    Usage usage) SK_OVERRIDE;
 
     /** Causes any deferred drawing to the device to be completed.
      */
     virtual void flush() SK_OVERRIDE {}
 
     virtual SkSurface* newSurface(const SkImageInfo&) SK_OVERRIDE;
+    virtual const void* peekPixels(SkImageInfo*, size_t* rowBytes) SK_OVERRIDE;
 
     SkBitmap    fBitmap;
 
     typedef SkBaseDevice INHERITED;
 };
 
 #endif // SkBitmapDevice_DEFINED